本课配套习题挑战模式1/5
小明和小刚从相距25.2千米的两地同时相向而行,小明每小时走4千米,3小时后两人相遇,设小刚的速度为x千米/时,列方程得( )
A: 4+3x=25.2 |
B: 3×4+x=25.2 |
C: 3(4+x)=25.2 |
D: 3(x-4)=25.2 |
- 提示1:PHA+562J6YeP5YWz57O777ya5LiJ5bCP5pe25YaF5Lik5Lq66LWw55qE6Lev56iL5LmL5ZKMPeS4pOWcsOeahOi3neemuzI1LjLljYPnsbM8L3A+
- 答案:Qw==
PHA+6Kej77ya6K6+5bCP5Yia55qE6YCf5bqm5Li6eOWNg+exsy/ml7bvvIzliJkz5bCP5pe25Lik5Lq66LWw55qE6Lev56iL5Li6M++8iDQreO+8ie+8jDxicj7moLnmja7kuInlsI/ml7blhoXkuKTkurrotbDnmoTot6/nqIvkuYvlkow95Lik5Zyw55qE6Led56a7MjUuMuWNg+exs+eahOetiemHj+WFs+ezuzxicj7lj6/lvpfliLDmlrnnqIvvvJoz77yINCt477yJPTI1LjIuPGJyPuaVhemAiUM8YnI+PC9wPg==
本课配套习题挑战模式2/5
汽车以72千米/时的速度在公路上行驶,开向寂静的山谷,驾驶员揿一下喇叭,4秒后听到了回响,这时候汽车离山谷多远?已知空气中声音的传播速度约为340米/秒. 设听到回响时,汽车离山谷x米,根据题意,列出方程为( )
A: 2x+4×20=4×340 |
B: 2x-4×72=4×340 |
C: 2x+4×72=4×340 |
D: 2x-4×20=4×340 |
- 提示1:PHA+55CG6Kej6aKY5oSP5om+5Ye66aKY5Lit5a2Y5Zyo55qE562J6YeP5YWz57O777ya5ZCs5Yiw5Zue5aOw5pe25rG96L2m56a75bGx6LC36Led56a755qEMuWAjSvmsb3ovabliY3ov5vnmoTot53nprs95aOw6Z+z5Lyg5pKt55qE6Led56a777yM5qC55o2u562J6YeP5YWz57O75YiX5pa556iL5Y2z5Y+vPC9wPg==
- 答案:QQ==
PHA+6Kej77ya6K6+5ZCs5Yiw5Zue5aOw5pe25rG96L2m56a75bGx6LC3eOexs++8jOWImeaxvei9puemu+Wxseiwt+i3neemu+eahDLlgI3ljbMyeO+8jDxicj7lm6DkuLrmsb3ovabnmoTpgJ/luqbmmK83MuWNg+exsy/ml7bljbMyMOexsy/np5LvvIw8YnI+5YiZ5rG96L2m5YmN6L+b55qE6Led56a75Li677yaNMOXMjDnsbMv56eS77yMPGJyPuWjsOmfs+S8oOaSreeahOi3neemu+S4uu+8mjTDlzM0MOexsy/np5LvvIw8YnI+5qC55o2u562J6YeP5YWz57O75YiX5pa556iL5b6X77yaMngrNMOXMjA9NMOXMzQw77yMPGJyPuaVhemAiUE8L3A+
本课配套习题挑战模式3/5
A: 7x=6.5x+5 |
B: 7x=6.5x-5 |
C: 7x+5=6.5x |
D: (7+6.5)x=5 |
- 提示1:IOetiemHj+WFs+ezu++8muS5mei3keeahOi3r+eoiz3nlLLot5HnmoTot6/nqIs=
- 答案:QQ==
6Kej77ya6K6+55Sy5Ye65Y+ReOenkumSn+WQjui/veS4iuS5me+8jOWImeeUsuaJgOi3keeahOi3r+eoi+S4ujd477yM6ICM5q2k5pe25LmZ5omA6LeR55qE6Lev56iL5Li6Ni41eCs177ybPGJyPuagueaNruatpOaXtuKAnOeUsui/veS4iuS5meKAnemCo+S5iOS7luS7rOeahOaAu+i3r+eoi+W6lOivpeebuOWQjO+8jOWNszd4PTYuNXgrNS4gPGJyPuaVhemAiUEuIA==
本课配套习题挑战模式4/5
某人以每小时5千米的速度从家步行到单位上班,下班时以每小时4千米的速度按原路返回,结果下班时比上班时多用10分钟,如果设上班时所用的时间为x小时,则下列根据题意所列方程正确的是( )
A: 5x=4(x-10) |
B: 5x=4(x+) |
C: 5(x−)=4x |
D: 5(x+)=4x |
- 提示1:PHA+6K6+5LiK54+t5pe25omA55So55qE5pe26Ze05Li6eOWwj+aXtu+8jOWImeS4i+ePreeUqOaXtu+8iHgrPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0IyLzExL3JCQUNFMVBrT1otU25rdGtBQUFCSnhnREo1MDE1Ny5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQjIvMTEvckJBQ0UxUGtPWi1Tbmt0a0FBQUJKeGdESjUwMTU3LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjciPu+8ieWwj+aXtu+8jOagueaNruS4iuePreOAgeS4i+ePreaJgOi1sOi3r+eoi+S4gOagt+WPr+W+l+WHuuaWueeoizwvcD4=
- 答案:Qg==
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
本课配套习题挑战模式5/5
A: 10 |
B: 15 |
C: 20 |
D: 30 |
- 提示1:IOatpOmimOaYr+eOr+W9oui/veWPiumXrumimO+8jOetiemHj+WFs+ezu+aYr+eUsuavlOW3suWkmui3keS6hjgwMOexs++8jOi/mOimgeazqOaEj+i3r+eoiz3pgJ/luqbDl+aXtumXtO+8jOWNs+WPr+axguW+ly4=
- 答案:Qw==
6Kej77ya5qC55o2u6aKY5oSP5b6XMzIwdC0yODB0PTgwMDxicj7op6PlvpfvvJp0PTIw77ybPGJyPuaVhemAiUMuIA==